WIP

src/connection.cpp

@@ -87,9 +87,9 @@ void Connection::close() {
   connections_active.dec();
 }
 
-// May be called off the io thread!
-void Connection::append_message(std::span<std::string_view> data_parts,
-                                Arena arena, bool close_after_send) {
+// Called from I/O thread only
+void Connection::append_bytes(std::span<std::string_view> data_parts,
+                              Arena arena, bool close_after_send) {
   // Calculate total bytes for this message. Don't need to hold the lock yet.
   size_t total_bytes = 0;
   for (const auto &part : data_parts) {
@@ -124,6 +124,30 @@ void Connection::append_message(std::span<std::string_view> data_parts,
   }
 }
 
+void Connection::send_response(void *protocol_context,
+                               std::string_view response_json, Arena arena) {
+  std::unique_lock lock(mutex_);
+
+  // Store response in queue for protocol handler processing
+  pending_response_queue_.emplace_back(
+      PendingResponse{protocol_context, response_json, std::move(arena)});
+
+  // Mark that we have pending responses and trigger epoll interest
+  if (!has_pending_responses_) {
+    has_pending_responses_ = true;
+
+    auto server = server_.lock();
+    if (fd_ >= 0 && server) {
+      // Add EPOLLOUT interest to trigger on_preprocess_writes
+      struct epoll_event event;
+      event.data.fd = fd_;
+      event.events = EPOLLIN | EPOLLOUT;
+      tsan_release();
+      epoll_ctl(server->epoll_fds_[epoll_index_], EPOLL_CTL_MOD, fd_, &event);
+    }
+  }
+}
+
 int Connection::readBytes(char *buf, size_t buffer_size) {
   int r;
   for (;;) {